Hi all,
I've downloaded and decrypted a track with the format 'AAC_24' from Spotify.
I already opened a thread on the 'Audio' Sub-Forum but we didn't get far and I wanted to post this in here too as this Sub-Forum is more active and it's somewhat related to Video Streaming Downloading.
A link to the unmodified (just decrypted) version of the file: https://forum.videohelp.com/attachments/80672-1720858349/file.aac
Its file header is 'SPaC' (Spotify Audio Codec?).
I hope someone has an idea.
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There is no "wrong decryption". Either it works or it doesn't and the file changes into a different kind of garbage data. The only way this file could be decrypted incorrectly would be if the garbage data blob arranged its bytes in a way where it looked like a file by chance but the chances of this happening is zero.
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I'll send it when i get home, but I'm guessing you want the Key and IV too?
It's AES-128-CTR btw -
There's also OGG_VORBIS_320/160/96 which are used by the spotify client (160 by default). I'm not sure where AAC_24 is used though. The formats you're referring to are MP4_256/128(_DUAL).
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AES-128-CTR
Key: a4c251a7b3bbab69b9f71b595cd56f8e
IV: 72e067fbddcbcf77ebe8bc643f630d93 -
All of the reverse engineering I've done so far can be found here: https://github.com/DevLARLEY/spotify-oggmp4-dl
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try using the musicfab spotify downloader - https://www.dvdfab.cn/spotify-converter.htm?trackid=headmenu2
the have a free trial. -
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This is what is returned by the Spotify API:
Code:{ "cdnurl": [ "https://audio4-ak-spotify-com.akamaized.net/audio/df6087632f48c2da7a049edf3bad9f5bf672781d?__token__=exp=1721240290~hmac=41d58b07ffe385e70919abe0ba28a69b5a6349766c1eefb546e9fc96081f6f87", "https://audio4-fa.scdn.co/audio/df6087632f48c2da7a049edf3bad9f5bf672781d?1721240290_9URiNZuQyx8F85BuWJc4LRoVkQ9wusKZDU9cYDsSKlc=" ], "fileid": "df6087632f48c2da7a049edf3bad9f5bf672781d", "result": "CDN", "ttl": 86400 }
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This is what ffmpeg outputs after printing 50 errors and warnings:
Code:Input #0, aac, from '.\file.aac': Duration: 00:00:38.85, bitrate: 133 kb/s Stream #0:0: Audio: aac (LC), 3.0, fltp, 131 kb/s
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I'm not asking about the file. I'm asking about the content on a web resource.
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Ah, 3m 33s
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If the content duration is '3m 33s', then why does FFmpeg show '00:00:38.85'? Something is wrong here.
For example.
I have two audio files in an 'AAC' container:
1. 1m 2s=996 KB.
2. 3m 49s=1,97 MB.
Can you save a session in 'Fiddler'?
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